Punctuation Questions Medium
The purpose of using an apostrophe in possessive nouns ending in 's' is to indicate ownership or possession. It shows that something belongs to or is associated with the noun that comes before the apostrophe. For example, in the sentence "John's car is blue," the apostrophe and 's' indicate that the car belongs to John. Without the apostrophe, it would simply be a plural noun indicating multiple cars owned by John.